17707415
Description
Quiz by Brage Haavik, updated more than 1 year ago
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Created by Brage Haavik
about 5 years ago
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Question 1
Question
Which of the following are sources of variance?
Answer
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The error
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The variance
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The treatment
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All of the above
Question 2
Question
Why would you use post-hoc tests instead of planned contrasts?
Answer
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We are interested in testing all possible comparisons
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We are not interested in testing all possible comparisons
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There is a need to improve the power of the test
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There are not many comparisons to make
Question 3
Question
How can you improve the power of your experiment?
Answer
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Increase the number of participants
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Reducing the degrees of freedom for the residual source of variance
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All of these
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Increasing the number of levels of treatment
Question 4
Question
Examine the following table, how many follow-up comparisons would you have to make if you choose a post-hoc style of testing?
Answer
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3
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2
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4
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5
Question 5
Question
Examine the followng ANOVA SPSS output. If you ran post-hoc tests using Bonferroni correction, what level of alpha should you use per comparison?
Answer
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0.005
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0.05
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0.01
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0.001
Question 6
Question
In the following study, the researcher ran a series of post-hoc tests using LSD. What was the alpha-value per comparison?
Answer
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0.30
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0.05
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0.15
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0.01
Question 7
Question
The power of a test is the probability of...
Answer
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Rejecting the null hypothesis when it is incorrect
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Accepting the null hypothesis when correct
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Accepting the alternative hypothesis when incorrect
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Rejecting the alternative hypothesis when incorrect
Question 8
Question
Imagine you are a Clinical Neuropsychologist who works with language difficulties shown by aphasics resulting from a brain stroke. You are interested in studying the impact of a particular treatment as a function of the time interval between the time of the lesion and the time of the intervention. If you want to maximize the power of your study, which groups would you use?
Answer
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Three groups: 1)Immediately after the stroke, 2) three weeks later, 3) six months later
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Two groups: 1)Immediately after the stroke, 2) six months later
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Two groups: 1) three weeks later, 2) six months later
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Two groups: 1)Immediately after the stroke, 2) three weeks later
Question 9
Question
Examine the following graph, if you wanted to demonstrate the the 9th grade students gave higher food ratings than the older ones, which contrast coefficients would you use?
Answer
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3 -2 -1 0
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2 -1 -1 0
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3 -1 -1 -1
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2 1 0 -3
Question 10
Question
If you take steps to minimize Type 1 error, then the probability of making a Type 2 error is
Answer
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Cut in half
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Increased
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Decreased
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Unaffected
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